DILLON CITY OF

DILLON, MT · ~4,300 people served

Check your exact address → DILLON overview

100

Excellent

PurityRadar safety score

PWSID

MT0000201

State

Montana

City

DILLON

Population served

4,300

Primary source

Groundwater

Score history

No change since tracking began Jun 18, 2026.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 100

2 score updates logged since tracking began Jun 18, 2026. Each future EPA re-score adds a point.

PFAS & contaminant readings

Latest detections from EPA’s UCMR5 monitoring (through Jul 2024). Levels in parts per trillion (ppt).

Lithium

18,000 ppt

limit —

No federal limit

Violations & enforcement

Violations on record

Unaddressed

Health-based

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Jun 2012. Official EPA record →

Monitoring & reporting · Total coliform began May 2012 Resolved

Monitoring & reporting · Total coliform began Nov 2011 Resolved

Monitoring & reporting · Total coliform began Nov 2005 Resolved

Monitoring & reporting · Lead & Copper Rule began Oct 2002 Resolved

Monitoring & reporting · Total coliform began Dec 1995 Resolved

Monitoring & reporting · Total coliform began Nov 1995 Resolved

Monitoring & reporting · Nitrate began Jan 1993 Resolved

Recent enforcement actions

State action · SIA Jun 2012
State action · SIE Jun 2012
State action · SOX Jun 2012
State action · SIA Dec 2011
State action · SIE Dec 2011
State action · SOX Dec 2011
State action · SOX May 2009
State action · SOX Dec 2008

This profile is built from EPA public records for system MT0000201 — SDWIS violations and UCMR5 PFAS sampling. The score is system-level and can’t account for your home’s plumbing (older pipes can add lead at the tap). For health decisions, check your exact address, read the utility’s Consumer Confidence Report, and confirm with your provider.